BufferedReader BufferedWriter HttpURLConnection

最新推荐文章于 2025-05-28 23:47:11 发布

原创最新推荐文章于 2025-05-28 23:47:11 发布 · 1.2k 阅读

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本文介绍了使用Java的BufferedReader和BufferedWriter进行网络数据读取及文件操作的方法，包括如何通过URL连接获取网络资源，并使用字节流与缓冲流进行高效的数据处理。

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			BufferedReader和BufferedWriter: 字符流, BufferedReader有readline（）方法
			从网络中读取数据
			URL url = new URL(urlStr);
			HttpURLConnection con = (HttpURLConnection)url.openConnection();
			BufferedReader br = new BufferedReader(new InputStreamReader(con.getInputStream()));
			
			BufferedWriter bw = new BufferedWriter(new FileWriter(file));
			BufferedReader br = new BufferedReader(new InputStreamReader(new FileInputStream(file)));
			bw.write("something");
			bw.newLine();
			bw.close();
			
			BufferedReader br = new BufferedReader(new FileReader(file));
			BufferedWriter bw = new BufferedWriter(new OutputStreamWriter(new FileOutputStream(file)));
			String line = br.readLine();
			
			InputStream与OutputStream: 字节流		 //常用于处理图片、声音等二进制文件，汉字之类的无法处理，如“a你好”
			BufferedInputStream与BufferedOutputStream 处理字节流
			BufferedInputStream bis = new BufferedInputStream(con.getInputStream());
			
			BufferedInputStream bis = new BufferedInputStream(new FileInputStream(file));
			BufferedOutputStream bos = new BufferedOutputStream(new FileOutputStream(file1));
			
			while (bis.available() > 0) {
				System.out.println((char)bis.read()); //bis.read()返回ASCII码值：int
			}
			
			byte[] buffer = new byte[1024];
			int num = -1;
			while((num = bis.read(buffer)) != -1){
				System.out.println("hello");
				bos.flush();
				bos.write(buffer, 0, num);
			}
			bos.close();
			bis.close();